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im working on a project and i need to make an app for hololens 2 that can scan the QR codes directly, im not familliar with this AR development thing so i tried to use the example from microsoft () but after i did everything i could my app is on the hololens 2 but it doesn't scan the codes, i mean when you using this sample your app suppose to detect the QR code and create a sort of rectangle around it, but i don't get this rectangle and yes i tried to do it on paper and even on my laptop screen and im sure it was big enough to detect (the implemented QR scanner in hololens 2 is detecting the QR code). So i installed the Microsoft.MixedReality.QR from nuget and i added MRTK thing to the project also in my Visual Studio for Community i installed all the packages for UWP development and Unity development but my app is still not working it does only draw some white debugging lines around me or something like that. Can someone tell me what i can do to make that thing work?
Code for QrCodeManager:
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using Microsoft.MixedReality.QR;
using System;
using System.Collections.Generic;
using UnityEngine;
namespace Microsoft.MixedReality.SampleQRCodes
{
public static class QRCodeEventArgs
{
public static QRCodeEventArgs<TData> Create<TData>(TData data)
{
return new QRCodeEventArgs<TData>(data);
}
}
[Serializable]
public class QRCodeEventArgs<TData> : EventArgs
{
public TData Data { get; private set; }
public QRCodeEventArgs(TData data)
{
Data = data;
}
}
public class QRCodesManager : Singleton<QRCodesManager>
{
[Tooltip("Determines if the QR codes scanner should be automatically started.")]
public bool AutoStartQRTracking = true;
public bool IsTrackerRunning { get; private set; }
public bool IsSupported { get; private set; }
public event EventHandler<bool> QRCodesTrackingStateChanged;
public event EventHandler<QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode>> QRCodeAdded;
public event EventHandler<QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode>> QRCodeUpdated;
public event EventHandler<QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode>> QRCodeRemoved;
private System.Collections.Generic.SortedDictionary<System.Guid, Microsoft.MixedReality.QR.QRCode> qrCodesList = new SortedDictionary<System.Guid, Microsoft.MixedReality.QR.QRCode>();
private QRCodeWatcher qrTracker;
private bool capabilityInitialized = false;
private QRCodeWatcherAccessStatus accessStatus;
private System.Threading.Tasks.Task<QRCodeWatcherAccessStatus> capabilityTask;
public System.Guid GetIdForQRCode(string qrCodeData)
{
lock (qrCodesList)
{
foreach (var ite in qrCodesList)
{
if (ite.Value.Data == qrCodeData)
{
return ite.Key;
}
}
}
return new System.Guid();
}
public System.Collections.Generic.IList<Microsoft.MixedReality.QR.QRCode> GetList()
{
lock (qrCodesList)
{
return new List<Microsoft.MixedReality.QR.QRCode>(qrCodesList.Values);
}
}
protected void Awake()
{
}
// Use this for initialization
async protected virtual void Start()
{
IsSupported = QRCodeWatcher.IsSupported();
capabilityTask = QRCodeWatcher.RequestAccessAsync();
accessStatus = await capabilityTask;
capabilityInitialized = true;
}
private void SetupQRTracking()
{
try
{
qrTracker = new QRCodeWatcher();
IsTrackerRunning = false;
qrTracker.Added += QRCodeWatcher_Added;
qrTracker.Updated += QRCodeWatcher_Updated;
qrTracker.Removed += QRCodeWatcher_Removed;
qrTracker.EnumerationCompleted += QRCodeWatcher_EnumerationCompleted;
}
catch (Exception ex)
{
Debug.Log("QRCodesManager : exception starting the tracker " + ex.ToString());
}
if (AutoStartQRTracking)
{
StartQRTracking();
}
}
public void StartQRTracking()
{
if (qrTracker != null && !IsTrackerRunning)
{
Debug.Log("QRCodesManager starting QRCodeWatcher");
try
{
qrTracker.Start();
IsTrackerRunning = true;
Debug.Log("QRCodeManager started!");
QRCodesTrackingStateChanged?.Invoke(this, true);
}
catch (Exception ex)
{
Debug.Log("QRCodesManager starting QRCodeWatcher Exception:" + ex.ToString());
}
}
}
public void StopQRTracking()
{
if (IsTrackerRunning)
{
IsTrackerRunning = false;
if (qrTracker != null)
{
qrTracker.Stop();
qrCodesList.Clear();
}
var handlers = QRCodesTrackingStateChanged;
if (handlers != null)
{
handlers(this, false);
}
}
}
private void QRCodeWatcher_Removed(object sender, QRCodeRemovedEventArgs args)
{
Debug.Log("QRCodesManager QRCodeWatcher_Removed");
bool found = false;
lock (qrCodesList)
{
if (qrCodesList.ContainsKey(args.Code.Id))
{
qrCodesList.Remove(args.Code.Id);
found = true;
}
}
if (found)
{
var handlers = QRCodeRemoved;
if (handlers != null)
{
handlers(this, QRCodeEventArgs.Create(args.Code));
}
}
}
private void QRCodeWatcher_Updated(object sender, QRCodeUpdatedEventArgs args)
{
Debug.Log("QRCodesManager QRCodeWatcher_Updated");
bool found = false;
lock (qrCodesList)
{
if (qrCodesList.ContainsKey(args.Code.Id))
{
found = true;
qrCodesList[args.Code.Id] = args.Code;
}
}
if (found)
{
var handlers = QRCodeUpdated;
if (handlers != null)
{
handlers(this, QRCodeEventArgs.Create(args.Code));
}
}
}
private void QRCodeWatcher_Added(object sender, QRCodeAddedEventArgs args)
{
Debug.Log("QRCodesManager QRCodeWatcher_Added");
lock (qrCodesList)
{
qrCodesList[args.Code.Id] = args.Code;
}
var handlers = QRCodeAdded;
if (handlers != null)
{
handlers(this, QRCodeEventArgs.Create(args.Code));
}
}
private void QRCodeWatcher_EnumerationCompleted(object sender, object e)
{
Debug.Log("QRCodesManager QrTracker_EnumerationCompleted");
}
private void Update()
{
if (qrTracker == null && capabilityInitialized && IsSupported)
{
if (accessStatus == QRCodeWatcherAccessStatus.Allowed)
{
SetupQRTracking();
}
else
{
Debug.Log("Capability access status : " + accessStatus);
}
}
}
}
}
And this is code for QRcodeVisualizer:
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System.Collections.Generic;
using UnityEngine;
namespace Microsoft.MixedReality.SampleQRCodes
{
public class QRCodesVisualizer : MonoBehaviour
{
public GameObject qrCodePrefab;
private SortedDictionary<System.Guid, GameObject> qrCodesObjectsList;
private bool clearExisting = false;
struct ActionData
{
public enum Type
{
Added,
Updated,
Removed
};
public Type type;
public Microsoft.MixedReality.QR.QRCode qrCode;
public ActionData(Type type, Microsoft.MixedReality.QR.QRCode qRCode) : this()
{
this.type = type;
qrCode = qRCode;
}
}
private Queue<ActionData> pendingActions = new Queue<ActionData>();
// Use this for initialization
void Start()
{
Debug.Log("QRCodesVisualizer start");
qrCodesObjectsList = new SortedDictionary<System.Guid, GameObject>();
QRCodesManager.Instance.QRCodesTrackingStateChanged += Instance_QRCodesTrackingStateChanged;
QRCodesManager.Instance.QRCodeAdded += Instance_QRCodeAdded;
QRCodesManager.Instance.QRCodeUpdated += Instance_QRCodeUpdated;
QRCodesManager.Instance.QRCodeRemoved += Instance_QRCodeRemoved;
if (qrCodePrefab == null)
{
throw new System.Exception("Prefab not assigned");
}
}
private void Instance_QRCodesTrackingStateChanged(object sender, bool status)
{
if (!status)
{
clearExisting = true;
}
}
private void Instance_QRCodeAdded(object sender, QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode> e)
{
Debug.Log("QRCodesVisualizer Instance_QRCodeAdded");
lock (pendingActions)
{
pendingActions.Enqueue(new ActionData(ActionData.Type.Added, e.Data));
}
}
private void Instance_QRCodeUpdated(object sender, QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode> e)
{
Debug.Log("QRCodesVisualizer Instance_QRCodeUpdated");
lock (pendingActions)
{
pendingActions.Enqueue(new ActionData(ActionData.Type.Updated, e.Data));
}
}
private void Instance_QRCodeRemoved(object sender, QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode> e)
{
Debug.Log("QRCodesVisualizer Instance_QRCodeRemoved");
lock (pendingActions)
{
pendingActions.Enqueue(new ActionData(ActionData.Type.Removed, e.Data));
}
}
private void HandleEvents()
{
lock (pendingActions)
{
while (pendingActions.Count > 0)
{
var action = pendingActions.Dequeue();
if (action.type == ActionData.Type.Added)
{
GameObject qrCodeObject = Instantiate(qrCodePrefab, new Vector3(0, 0, 0), Quaternion.identity);
qrCodeObject.GetComponent<SpatialGraphNodeTracker>().Id = action.qrCode.SpatialGraphNodeId;
qrCodeObject.GetComponent<QRCode>().qrCode = action.qrCode;
qrCodesObjectsList.Add(action.qrCode.Id, qrCodeObject);
}
else if (action.type == ActionData.Type.Updated)
{
if (!qrCodesObjectsList.ContainsKey(action.qrCode.Id))
{
GameObject qrCodeObject = Instantiate(qrCodePrefab, new Vector3(0, 0, 0), Quaternion.identity);
qrCodeObject.GetComponent<SpatialGraphNodeTracker>().Id = action.qrCode.SpatialGraphNodeId;
qrCodeObject.GetComponent<QRCode>().qrCode = action.qrCode;
qrCodesObjectsList.Add(action.qrCode.Id, qrCodeObject);
}
}
else if (action.type == ActionData.Type.Removed)
{
if (qrCodesObjectsList.ContainsKey(action.qrCode.Id))
{
Destroy(qrCodesObjectsList[action.qrCode.Id]);
qrCodesObjectsList.Remove(action.qrCode.Id);
}
}
}
}
if (clearExisting)
{
clearExisting = false;
foreach (var obj in qrCodesObjectsList)
{
Destroy(obj.Value);
}
qrCodesObjectsList.Clear();
}
}
// Update is called once per frame
void Update()
{
HandleEvents();
}
}
}
Those two scripts are attached to an Empty thing in Unity engine, also there is an QR Code Prefab attached to the QRcodeVisualizer script. You can find this sample here ()
im working on a project and i need to make an app for hololens 2 that can scan the QR codes directly, im not familliar with this AR development thing so i tried to use the example from microsoft (https://learn.microsoft/en-us/windows/mixed-reality/develop/advanced-concepts/qr-code-tracking-overview) but after i did everything i could my app is on the hololens 2 but it doesn't scan the codes, i mean when you using this sample your app suppose to detect the QR code and create a sort of rectangle around it, but i don't get this rectangle and yes i tried to do it on paper and even on my laptop screen and im sure it was big enough to detect (the implemented QR scanner in hololens 2 is detecting the QR code). So i installed the Microsoft.MixedReality.QR from nuget and i added MRTK thing to the project also in my Visual Studio for Community i installed all the packages for UWP development and Unity development but my app is still not working it does only draw some white debugging lines around me or something like that. Can someone tell me what i can do to make that thing work?
Code for QrCodeManager:
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using Microsoft.MixedReality.QR;
using System;
using System.Collections.Generic;
using UnityEngine;
namespace Microsoft.MixedReality.SampleQRCodes
{
public static class QRCodeEventArgs
{
public static QRCodeEventArgs<TData> Create<TData>(TData data)
{
return new QRCodeEventArgs<TData>(data);
}
}
[Serializable]
public class QRCodeEventArgs<TData> : EventArgs
{
public TData Data { get; private set; }
public QRCodeEventArgs(TData data)
{
Data = data;
}
}
public class QRCodesManager : Singleton<QRCodesManager>
{
[Tooltip("Determines if the QR codes scanner should be automatically started.")]
public bool AutoStartQRTracking = true;
public bool IsTrackerRunning { get; private set; }
public bool IsSupported { get; private set; }
public event EventHandler<bool> QRCodesTrackingStateChanged;
public event EventHandler<QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode>> QRCodeAdded;
public event EventHandler<QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode>> QRCodeUpdated;
public event EventHandler<QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode>> QRCodeRemoved;
private System.Collections.Generic.SortedDictionary<System.Guid, Microsoft.MixedReality.QR.QRCode> qrCodesList = new SortedDictionary<System.Guid, Microsoft.MixedReality.QR.QRCode>();
private QRCodeWatcher qrTracker;
private bool capabilityInitialized = false;
private QRCodeWatcherAccessStatus accessStatus;
private System.Threading.Tasks.Task<QRCodeWatcherAccessStatus> capabilityTask;
public System.Guid GetIdForQRCode(string qrCodeData)
{
lock (qrCodesList)
{
foreach (var ite in qrCodesList)
{
if (ite.Value.Data == qrCodeData)
{
return ite.Key;
}
}
}
return new System.Guid();
}
public System.Collections.Generic.IList<Microsoft.MixedReality.QR.QRCode> GetList()
{
lock (qrCodesList)
{
return new List<Microsoft.MixedReality.QR.QRCode>(qrCodesList.Values);
}
}
protected void Awake()
{
}
// Use this for initialization
async protected virtual void Start()
{
IsSupported = QRCodeWatcher.IsSupported();
capabilityTask = QRCodeWatcher.RequestAccessAsync();
accessStatus = await capabilityTask;
capabilityInitialized = true;
}
private void SetupQRTracking()
{
try
{
qrTracker = new QRCodeWatcher();
IsTrackerRunning = false;
qrTracker.Added += QRCodeWatcher_Added;
qrTracker.Updated += QRCodeWatcher_Updated;
qrTracker.Removed += QRCodeWatcher_Removed;
qrTracker.EnumerationCompleted += QRCodeWatcher_EnumerationCompleted;
}
catch (Exception ex)
{
Debug.Log("QRCodesManager : exception starting the tracker " + ex.ToString());
}
if (AutoStartQRTracking)
{
StartQRTracking();
}
}
public void StartQRTracking()
{
if (qrTracker != null && !IsTrackerRunning)
{
Debug.Log("QRCodesManager starting QRCodeWatcher");
try
{
qrTracker.Start();
IsTrackerRunning = true;
Debug.Log("QRCodeManager started!");
QRCodesTrackingStateChanged?.Invoke(this, true);
}
catch (Exception ex)
{
Debug.Log("QRCodesManager starting QRCodeWatcher Exception:" + ex.ToString());
}
}
}
public void StopQRTracking()
{
if (IsTrackerRunning)
{
IsTrackerRunning = false;
if (qrTracker != null)
{
qrTracker.Stop();
qrCodesList.Clear();
}
var handlers = QRCodesTrackingStateChanged;
if (handlers != null)
{
handlers(this, false);
}
}
}
private void QRCodeWatcher_Removed(object sender, QRCodeRemovedEventArgs args)
{
Debug.Log("QRCodesManager QRCodeWatcher_Removed");
bool found = false;
lock (qrCodesList)
{
if (qrCodesList.ContainsKey(args.Code.Id))
{
qrCodesList.Remove(args.Code.Id);
found = true;
}
}
if (found)
{
var handlers = QRCodeRemoved;
if (handlers != null)
{
handlers(this, QRCodeEventArgs.Create(args.Code));
}
}
}
private void QRCodeWatcher_Updated(object sender, QRCodeUpdatedEventArgs args)
{
Debug.Log("QRCodesManager QRCodeWatcher_Updated");
bool found = false;
lock (qrCodesList)
{
if (qrCodesList.ContainsKey(args.Code.Id))
{
found = true;
qrCodesList[args.Code.Id] = args.Code;
}
}
if (found)
{
var handlers = QRCodeUpdated;
if (handlers != null)
{
handlers(this, QRCodeEventArgs.Create(args.Code));
}
}
}
private void QRCodeWatcher_Added(object sender, QRCodeAddedEventArgs args)
{
Debug.Log("QRCodesManager QRCodeWatcher_Added");
lock (qrCodesList)
{
qrCodesList[args.Code.Id] = args.Code;
}
var handlers = QRCodeAdded;
if (handlers != null)
{
handlers(this, QRCodeEventArgs.Create(args.Code));
}
}
private void QRCodeWatcher_EnumerationCompleted(object sender, object e)
{
Debug.Log("QRCodesManager QrTracker_EnumerationCompleted");
}
private void Update()
{
if (qrTracker == null && capabilityInitialized && IsSupported)
{
if (accessStatus == QRCodeWatcherAccessStatus.Allowed)
{
SetupQRTracking();
}
else
{
Debug.Log("Capability access status : " + accessStatus);
}
}
}
}
}
And this is code for QRcodeVisualizer:
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System.Collections.Generic;
using UnityEngine;
namespace Microsoft.MixedReality.SampleQRCodes
{
public class QRCodesVisualizer : MonoBehaviour
{
public GameObject qrCodePrefab;
private SortedDictionary<System.Guid, GameObject> qrCodesObjectsList;
private bool clearExisting = false;
struct ActionData
{
public enum Type
{
Added,
Updated,
Removed
};
public Type type;
public Microsoft.MixedReality.QR.QRCode qrCode;
public ActionData(Type type, Microsoft.MixedReality.QR.QRCode qRCode) : this()
{
this.type = type;
qrCode = qRCode;
}
}
private Queue<ActionData> pendingActions = new Queue<ActionData>();
// Use this for initialization
void Start()
{
Debug.Log("QRCodesVisualizer start");
qrCodesObjectsList = new SortedDictionary<System.Guid, GameObject>();
QRCodesManager.Instance.QRCodesTrackingStateChanged += Instance_QRCodesTrackingStateChanged;
QRCodesManager.Instance.QRCodeAdded += Instance_QRCodeAdded;
QRCodesManager.Instance.QRCodeUpdated += Instance_QRCodeUpdated;
QRCodesManager.Instance.QRCodeRemoved += Instance_QRCodeRemoved;
if (qrCodePrefab == null)
{
throw new System.Exception("Prefab not assigned");
}
}
private void Instance_QRCodesTrackingStateChanged(object sender, bool status)
{
if (!status)
{
clearExisting = true;
}
}
private void Instance_QRCodeAdded(object sender, QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode> e)
{
Debug.Log("QRCodesVisualizer Instance_QRCodeAdded");
lock (pendingActions)
{
pendingActions.Enqueue(new ActionData(ActionData.Type.Added, e.Data));
}
}
private void Instance_QRCodeUpdated(object sender, QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode> e)
{
Debug.Log("QRCodesVisualizer Instance_QRCodeUpdated");
lock (pendingActions)
{
pendingActions.Enqueue(new ActionData(ActionData.Type.Updated, e.Data));
}
}
private void Instance_QRCodeRemoved(object sender, QRCodeEventArgs<Microsoft.MixedReality.QR.QRCode> e)
{
Debug.Log("QRCodesVisualizer Instance_QRCodeRemoved");
lock (pendingActions)
{
pendingActions.Enqueue(new ActionData(ActionData.Type.Removed, e.Data));
}
}
private void HandleEvents()
{
lock (pendingActions)
{
while (pendingActions.Count > 0)
{
var action = pendingActions.Dequeue();
if (action.type == ActionData.Type.Added)
{
GameObject qrCodeObject = Instantiate(qrCodePrefab, new Vector3(0, 0, 0), Quaternion.identity);
qrCodeObject.GetComponent<SpatialGraphNodeTracker>().Id = action.qrCode.SpatialGraphNodeId;
qrCodeObject.GetComponent<QRCode>().qrCode = action.qrCode;
qrCodesObjectsList.Add(action.qrCode.Id, qrCodeObject);
}
else if (action.type == ActionData.Type.Updated)
{
if (!qrCodesObjectsList.ContainsKey(action.qrCode.Id))
{
GameObject qrCodeObject = Instantiate(qrCodePrefab, new Vector3(0, 0, 0), Quaternion.identity);
qrCodeObject.GetComponent<SpatialGraphNodeTracker>().Id = action.qrCode.SpatialGraphNodeId;
qrCodeObject.GetComponent<QRCode>().qrCode = action.qrCode;
qrCodesObjectsList.Add(action.qrCode.Id, qrCodeObject);
}
}
else if (action.type == ActionData.Type.Removed)
{
if (qrCodesObjectsList.ContainsKey(action.qrCode.Id))
{
Destroy(qrCodesObjectsList[action.qrCode.Id]);
qrCodesObjectsList.Remove(action.qrCode.Id);
}
}
}
}
if (clearExisting)
{
clearExisting = false;
foreach (var obj in qrCodesObjectsList)
{
Destroy(obj.Value);
}
qrCodesObjectsList.Clear();
}
}
// Update is called once per frame
void Update()
{
HandleEvents();
}
}
}
Those two scripts are attached to an Empty thing in Unity engine, also there is an QR Code Prefab attached to the QRcodeVisualizer script. You can find this sample here (https://github/microsoft/MixedReality-QRCode-Sample)
Share Improve this question edited Apr 1 at 12:38 koto pes ESQ asked Apr 1 at 12:05 koto pes ESQkoto pes ESQ 111 bronze badge New contributor koto pes ESQ is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. 6 | Show 1 more comment2 Answers
Reset to default 0Are you using the "main" branch of this QR code sample? If you are, try switching to the "openxr" branch - microsoft/MixedReality-QRCode-Sample at OpenXR (github).
Note that the "main" branch of this sample is working with Unity's "Windows XR Plugin" which works with the WinRT APIs in in Unity 2019 or 2020 LTS versions.
After upgrading to Unity 2020 or Unity 2021, You can also use "OpenXR plugin" for HoloLens 2 developement. With OpenXR plugin, the app can use the built-in support for SpatialGraphNode, and the QR code tracking will work mostly the same way as above.
To view the OpenXR version of the QRCode tracking on HoloLens 2, please checkout the "openxr" branch of this sample repro, https://github/microsoft/MixedReality-QRCode-Sample/tree/OpenXR.
As mentioned the issue in your setup seems to be the lack of something that actually initiates the tracking process.
From the Samples Readme
You can find the full article on QR code tracking on Microsoft Docs. The following is a breakdown of each C# script in the sample app:
QRCode.cs- This script is attached to the QR code object and populates the text displayed in the scene with the QR code properties on Start.
QRCodesManager.cs- This is the main class that handles the QR SDK, including:
- Loading the plugin
- Checking if tracking is supported
- Requesting access to the webcame
- Adding event listeners for new, updated, and removed QR codes
- Handling events through callback functions
- Starting and stopping QR code tracking
- Maintaining a local list of QR codes
QRCodesSetup.cs- Kicks off the QR code manager tracking functionality inQRCodesManager.
QRCodesVisualizer.cs- Handles all QR code visualizing in the scene and instantiates all QR codes in the local list kept inQRCodesManager.
SpatialGraphNodeTracker.cs- This script is attached to the QR code object and transforms real-world QR code coordinates into the Unity coordinate system. The script also places the virtual QR code in the scene at the same location as the real-world QR code.
SpatialGraphNode.cs- This script is abstracting the tracking of a spatial graph static node, which represents the tracking information of QR code in aGUIDid.
=> Minimum you somewhere have to call QRCodesManager.StartQRTracking!
In the samples this seems to be handled by the component QRCodesSetup
本文标签： cUnity QR scanning app for Hololens 2 doen39t detect QR codeStack Overflow
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QRCodesSetup.csor some of your own app logic that initiates the tracking by callingQRCodesManager.StartQRTracking()– derHugo Commented Apr 1 at 20:17QRCodesManageris basically just the interface for doing the tracking and theQRCodesVisualizer.. well as the name says ... but unless you callQRCodesManager.StartQRTracking()your setup won't do anything – derHugo Commented Apr 2 at 10:47